A business letter is a professional, formal letter that is sent by one company to another. These letters can be used for professional correspondence between business clients, employees, stakeholders as well as individuals.

A report is a specific form of writing that is organised around concisely identifying and examining issues, events, or findings that have happened in a physical sense, such as events that have occurred within an organisation, or findings from a research investigation

A memorandum is a written message that is typically used in a professional setting. Commonly abbreviated "memo," these messages are usually brief and are designed to be easily and quickly understood. Memos can thus communicate important information efficiently in order to make dynamic and effective changes